-79.37% is the change from 829 to 171
Calculation steps:
[( 171 - 829 ) ÷ 829] x 100 = -79.37%
Formula
Percentage change = [(171 - 829) / 829] x 100
Subtract the new number by the original number
171 - 829 = -658
-658 ÷ 829 = -0.7937273823884198
-0.7937273823884198 x 100 = -79.37%